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  <xs:element id="lmb_WintrustRevolvingCreditFacilityMember" abstract="true" name="WintrustRevolvingCreditFacilityMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lmb_LongTermDebtGrossAndLeaseObligation" abstract="false" name="LongTermDebtGrossAndLeaseObligation" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="lmb_ARWintrustRevolvingCreditFacilityMember" abstract="true" name="ARWintrustRevolvingCreditFacilityMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lmb_DebtInstrumentBasisSpreadOnVariableRateAdjustment" abstract="false" name="DebtInstrumentBasisSpreadOnVariableRateAdjustment" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="lmb_LongTermLineOfCreditAverageDailyBalance" abstract="false" name="LongTermLineOfCreditAverageDailyBalance" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="lmb_SeniorLeverageRatioCovenantAxis" abstract="true" name="SeniorLeverageRatioCovenantAxis" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType"/>
  <xs:element id="lmb_SeniorLeverageRatioCovenantDomain" abstract="true" name="SeniorLeverageRatioCovenantDomain" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lmb_LevelOneMember" abstract="true" name="LevelOneMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lmb_LevelTwoMember" abstract="true" name="LevelTwoMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lmb_WintrustRevolvingLoanMember" abstract="true" name="WintrustRevolvingLoanMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lmb_SeniorLeverageRatio" abstract="false" name="SeniorLeverageRatio" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="lmb_SaleLeasebackTransactionPurchasePriceExcludingTenantImprovementAllowance" abstract="false" name="SaleLeasebackTransactionPurchasePriceExcludingTenantImprovementAllowance" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="lmb_SaleLeasebackTransactionTenantImprovementAllowance" abstract="false" name="SaleLeasebackTransactionTenantImprovementAllowance" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="lmb_SalesLeasebackTransactionsLesseeFinanceLeaseTermOfContract" abstract="false" name="SalesLeasebackTransactionsLesseeFinanceLeaseTermOfContract" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="lmb_SalesLeasebackTransactionsLeaseAgreementNumberOfRenewalTerms" abstract="false" name="SalesLeasebackTransactionsLeaseAgreementNumberOfRenewalTerms" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="lmb_SalesLeasebackTransactionsLesseeFinanceLeaseRenewalTerm" abstract="false" name="SalesLeasebackTransactionsLesseeFinanceLeaseRenewalTerm" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="lmb_SaleLeasebackTransactionAnnualMinimumRent" abstract="false" name="SaleLeasebackTransactionAnnualMinimumRent" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="lmb_SalesLeasebackTransactionAnnualRentIncrease" abstract="false" name="SalesLeasebackTransactionAnnualRentIncrease" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="lmb_SaleAndLeasebackTransactionLeaseAgreementTerminationFee" abstract="false" name="SaleAndLeasebackTransactionLeaseAgreementTerminationFee" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="lmb_SalesLeasebackTransactionFinanceLeaseLiabilityNet" abstract="false" name="SalesLeasebackTransactionFinanceLeaseLiabilityNet" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="lmb_SalesLeasebackTransactionFinancingInterestExpense" abstract="false" name="SalesLeasebackTransactionFinancingInterestExpense" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="lmb_A2019EmployeeStockPurchasePlanMember" abstract="true" name="A2019EmployeeStockPurchasePlanMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lmb_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumEmployeeSubscriptionPercentage" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumEmployeeSubscriptionPercentage" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="lmb_SharebasedCompensationArrangementbySharebasedPaymentAwardMaximumEmployeeSubscriptionAmount" abstract="false" name="SharebasedCompensationArrangementbySharebasedPaymentAwardMaximumEmployeeSubscriptionAmount" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="lmb_ShareBasedCompensationArrangementBySharebasedPaymentAwardOfferingPeriod" abstract="false" name="ShareBasedCompensationArrangementBySharebasedPaymentAwardOfferingPeriod" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="lmb_WintrustTermLoanMember" abstract="true" name="WintrustTermLoanMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lmb_IndustrialAirTransactionMember" abstract="true" name="IndustrialAirTransactionMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lmb_KentIslandMember" abstract="true" name="KentIslandMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lmb_ConsolidatedMechanicalMember" abstract="true" name="ConsolidatedMechanicalMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lmb_JakeMarshallLLCJMLLCAndCoatingSolutionsLLCCSLLCMember" abstract="true" name="JakeMarshallLLCJMLLCAndCoatingSolutionsLLCCSLLCMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lmb_EarnOutPaymentOneMember" abstract="true" name="EarnOutPaymentOneMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lmb_EarnOutPaymentTwoMember" abstract="true" name="EarnOutPaymentTwoMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lmb_BusinessCombinationConsiderationNumberOfEarnoutPayments" abstract="false" name="BusinessCombinationConsiderationNumberOfEarnoutPayments" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="lmb_BusinessCombinationsContingentConsiderationGrossProfitsOfAcquireeThresholdAmount" abstract="false" name="BusinessCombinationsContingentConsiderationGrossProfitsOfAcquireeThresholdAmount" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="lmb_BusinessCombinationContingentConsiderationEarnoutPeriod" abstract="false" name="BusinessCombinationContingentConsiderationEarnoutPeriod" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="lmb_BusinessCombinationPaymentForContingentConsiderationLiability" abstract="false" name="BusinessCombinationPaymentForContingentConsiderationLiability" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="lmb_GainLossOnChangeInFairValueOfInterestRateSwap" abstract="false" name="GainLossOnChangeInFairValueOfInterestRateSwap" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="lmb_OvernightRepurchaseAgreementsMember" abstract="true" name="OvernightRepurchaseAgreementsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lmb_SecondIAEarnoutPeriodMember" abstract="true" name="SecondIAEarnoutPeriodMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lmb_FirstKentIslandEarnoutPeriodMember" abstract="true" name="FirstKentIslandEarnoutPeriodMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lmb_FirstConsolidatedMechanicalEarnoutPeriodMember" abstract="true" name="FirstConsolidatedMechanicalEarnoutPeriodMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lmb_SecondKentIslandEarnoutPeriodMember" abstract="true" name="SecondKentIslandEarnoutPeriodMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lmb_SecondConsolidatedMechanicalEarnoutPeriodMember" abstract="true" name="SecondConsolidatedMechanicalEarnoutPeriodMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lmb_PaymentForContingentConsiderationLiability" abstract="false" name="PaymentForContingentConsiderationLiability" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="lmb_ServiceBasedRestrictedStockUnitsRSUsMember" abstract="true" name="ServiceBasedRestrictedStockUnitsRSUsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lmb_LeaseRightOfUseAsset" abstract="false" name="LeaseRightOfUseAsset" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="lmb_LeaseLiability" abstract="false" name="LeaseLiability" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="lmb_OperatingLeaseRightOfUseAssetAccumulatedAmortization" abstract="false" name="OperatingLeaseRightOfUseAssetAccumulatedAmortization" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="lmb_SalesLeasebackTransactionFinanceLeaseLiability" abstract="false" name="SalesLeasebackTransactionFinanceLeaseLiability" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="lmb_LeaseTypeAxis" abstract="true" name="LeaseTypeAxis" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType"/>
  <xs:element id="lmb_LeaseTypeDomain" abstract="true" name="LeaseTypeDomain" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lmb_OperatingLeaseMember" abstract="true" name="OperatingLeaseMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lmb_FinanceLeaseMember" abstract="true" name="FinanceLeaseMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lmb_FinanceLeaseLiabilityToBePaidAfterYearFour" abstract="false" name="FinanceLeaseLiabilityToBePaidAfterYearFour" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="lmb_LesseeOperatingLeaseLiabilityToBePaidAfterYearFour" abstract="false" name="LesseeOperatingLeaseLiabilityToBePaidAfterYearFour" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="lmb_LessorOperatingLeasePaymentToBeReceivedAfterYearFour" abstract="false" name="LessorOperatingLeasePaymentToBeReceivedAfterYearFour" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="lmb_WeightedAverageLeaseTermAbstract" abstract="true" name="WeightedAverageLeaseTermAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="lmb_WeightedAverageDiscountRateAbstract" abstract="true" name="WeightedAverageDiscountRateAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="lmb_SaleLeasebackTransactionDiscountRate" abstract="false" name="SaleLeasebackTransactionDiscountRate" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="lmb_FinanceLeasePrincipalAndDisposalsPayments" abstract="false" name="FinanceLeasePrincipalAndDisposalsPayments" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="lmb_PaymentToAcquireWorkersCompensationAndGeneralLiabilityInsurance" abstract="false" name="PaymentToAcquireWorkersCompensationAndGeneralLiabilityInsurance" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="lmb_PercentageOfSharesToBeIssuedUnderGrant" abstract="false" name="PercentageOfSharesToBeIssuedUnderGrant" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="lmb_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsPerformanceFactorAdjustment" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsPerformanceFactorAdjustment" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="lmb_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsPerformanceFactorAdjustmentInPeriodWeightedAverageGrantDateFairValue" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsPerformanceFactorAdjustmentInPeriodWeightedAverageGrantDateFairValue" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:perShareItemType"/>
  <xs:element id="lmb_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsPerformanceFactorActualAmount" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsPerformanceFactorActualAmount" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="lmb_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsPerformanceFactorAdjustmentPercent" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsPerformanceFactorAdjustmentPercent" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="lmb_CYMCORInc.Member" abstract="true" name="CYMCORInc.Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
</xs:schema>
